On Friday, OWN announced that Rosie O'Donnell would tape her final episode this Tuesday. (It will air on Friday, March 30.) The show, which debuted in October, averaged just 497,000 viewers. Trump pounced quickly.

"Rosie O'Donnell has failed again," Trump tweeted on Monday. "Her ratings were abysmal and Oprah cancelled her on Friday night. When will media executives learn that Rosie just hasn't got it."

Trump continued his rant on Monday's Fox and Friends. "Frankly, [the cancellation] was just going to happen," he said. "I knew it immediately when they announced it. Rosie fails at everything. ... Some moron will come and hire her again to do something else and that will fail. At some point, let her rest. Let her go away."

O'Donnell and Trump have been feuding since 2006, when O'Donnell criticized Trump on The View for not dethroning then Miss USA Tara Conner for alleged drug use.

O'Donnell has yet to fire back at Trump, but she did retweet his comment about her failed show.